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[Troubleshooting Series] Case 25 Network problem when goes through LTE interface

Latest reply: Jan 16, 2019 01:01:56 1028 1 1 0 0

Physical Network Topology



Fault Description

Cannot get access to the public network.

Configuration Files

l   AR

acl name Ethernet0/0/0 2998  
 rule 5 permit 
acl name AllowNovum 2999  
 rule 5 permit source 

traffic classifier VOICE operator or
 if-match dscp ef 
traffic classifier BEST_EFFORTS operator or
 if-match dscp default 
traffic classifier CONTROL operator or
 if-match dscp cs7 
traffic classifier SIGNALLING operator or
 if-match dscp cs6 
traffic behavior VOICE
 queue ef bandwidth pct 10
traffic behavior BEST_EFFORTS
 queue wfq
traffic behavior CONTROL
 queue ef bandwidth pct 5
traffic behavior SIGNALLING
 queue ef bandwidth pct 2
traffic policy qos_g_Ethernet0/0/0
 classifier CONTROL behavior CONTROL
 classifier SIGNALLING behavior SIGNALLING
 classifier VOICE behavior VOICE
interface Cellular0/0/0
 tcp adjust-mss 1200
 dialer enable-circular
 dialer-group 1
 dialer timer autodial 20
 dialer number *99# autodial
 standby track nqa admin test
 ip address negotiate
nqa test-instance admin test
 test-type icmp
 destination-address ipv4
 frequency 5
 probe-count 5
wlan ac
 wmm-profile name default id 0
 traffic-profile name default id 0
 security-profile name default id 0

Troubleshooting Procedure

                               Step 1      Checking the status of LTE interface, run the display interface cellular 0/0/0 command to check the result.


                               Step 2      The LTE interface is down. By checking the configuration, there is a standby under the LTE interface and the NQA works fine, so the interface is down. After undo the standby command, interface becomes up.

But the interface still can’t get ip address

Run the display cellular 0/0/0 all to check the parameter of LTE :


                               Step 3      The current service is no services. We need make sure that the apn is right, and the sim card is not arrears. After change the apn, the interface can get ip address now.

But the lan users still can’t get access to the internet.

                               Step 4      Checking the route on AR, there's no default route. So packets will not be sent out correctly. And we should configure nat outbound under the LTE interface to make the packets can come back.

Root Cause

Configuration issue results the interface can't become up and can't get ip address.

It's because there's no nat and no default route which leads to the LAN users can't get accessible to the public network.

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Created Jan 16, 2019 01:01:56

Thanks for sharing!
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